@article{9523,
  author = {Carl Hansen and W. Spangenberg},
  title = {Pulsational Stability of Pure-Helium Stars of Low Mass},
  year = {1971},
  journal = {Astrophysical Journal},
  volume = {163},
  chapter = {653},
  pages = {653-654},
  month = {02/1971},
  url = {http://adsabs.harvard.edu/full/1971ApJ...163..653H},
  doi = {10.1086/150808},
  note = {JILA Pub. 683},
}